Processing and engineering of pervaporation dehydration of ethylene glycol via dual-layer polybenzimidazole (PBI)/polyetherimide (PEI) membranes

Thin film composite membranes comprising of polyamide and polydopamine for dehydration of ethylene glycol by pervaporation

“…This may be attributed to the smaller size of water molecules, which diffuses through the membrane more easily. Similar observations were also obtained by Wang et al who used polybenzimidazole/polyetherimide membranes for the dehydration of ethylene glycol [45]. In addition, an increase in the feed water concentration tended to increase the permeability of ethylene glycol, while the opposite was found true for water.…”

Thermodynamic and mechanistic studies on recovering phenol crystals from dilute aqueous solutions using pervaporation–crystallization coupling (PVCC) system

“…As a result, there will be an appropriate temperature in the crystallizer for desublimation of phenol without trapping water. An increase in the permeate pressure will increase in the dew point of the permeate (Wang et al, 2011). Our experimental results have shown that only phenol vapor was desublimated as crystals when the crystallizer was maintained at a proper temperature.…”

Pervaporation technology for regeneration of diethylene glycol at Russian complex gas treatment plants with the use of ceramic membranes HybSi

“…It is also noteworthy that, except for HybSi membranes, no other membranes of Table 1 passed lab testing within several years of continuous operation (at least, for PV separation of glycol/water mixtures), and field data obtained at commercial PV plants are not public and have never been published in the open scientific literature. All remaining studies of Table 1 were carried out within several hours of experimental operation except for two studies reported in Du et al (2008) and Wang et al (2011) in which, in addition to short-term experiments, the membrane stability was investigated within~1 month of continuous operation of a PV unit dehydrating the EG/ water mixtures.…”